Reliable BCAST
	n Each node keeps cache of recently transmitted packets (FIFO, small) n Each node, upon receiving packet X from sender S, checks whether it received packet X-1 from that sender Ø If not, broadcast retransmission request (NACK) to 1-hop neighbors Ø Neighbors listen to overhear other retransmission and cancels theirs n First set of experiments revealed that under high traffic load, too many NACKs were issued, flooding the network and resulting in overall worse performance (70% PDR for 10 sender scenarios) n Added feature: NACK throttle